454 build up
Horsepoweraddiction, You say you have (3) 454 motors. For now build a mild streetable 454 for your truck. Take a block, crank, rod & pistons, and your 781 heads to the machine shop. Have the machinist check the block, then have it dipped, bored & honed, install new cam bearings, freeze plugs, screw-in oil gallery plugs, and deck the block. Have the crank checked, if ok have it polished. Have the pistons removed from rods, install Arp rod bolts and then have rods resized. Purchase Keith Black Icon Forged Pistons part# IC779 at CNC Motorsports for $510.95, Jegs $649.99, Summit Racing $719.95 and have them installed on rods. Have your heads checked out and don't forget to have the matching springs for your XE274H-10 camshaft installed. With a build like this it will be strong enough for the 100-150 shot of nitrous to get you to 550hp.